frostfs-api-go/util/proto/marshal_test.go

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package proto_test
import (
"testing"
"github.com/nspcc-dev/neofs-api-go/util/proto"
"github.com/nspcc-dev/neofs-api-go/util/proto/test"
"github.com/pkg/errors"
"github.com/stretchr/testify/require"
)
type stablePrimitives struct {
FieldA []byte
}
func (s *stablePrimitives) stableMarshal(buf []byte) ([]byte, error) {
if s == nil {
return []byte{}, nil
}
if buf == nil {
buf = make([]byte, s.stableSize())
}
var (
i, offset int
)
offset, err := proto.BytesMarshal(1, buf, s.FieldA)
if err != nil {
return nil, errors.Wrap(err, "can't marshal field a")
}
i += offset
return buf, nil
}
func (s *stablePrimitives) stableMarshalWrongFieldNum(buf []byte) ([]byte, error) {
if s == nil {
return []byte{}, nil
}
if buf == nil {
buf = make([]byte, s.stableSize())
}
var (
i, offset int
)
offset, err := proto.BytesMarshal(1+1, buf, s.FieldA)
if err != nil {
return nil, errors.Wrap(err, "can't marshal field a")
}
i += offset
return buf, nil
}
func (s *stablePrimitives) stableSize() int {
return proto.BytesSize(1, s.FieldA)
}
func TestBytesMarshal(t *testing.T) {
t.Run("not empty", func(t *testing.T) {
data := []byte("Hello World")
testBytesMarshal(t, data, false)
testBytesMarshal(t, data, true)
})
t.Run("empty", func(t *testing.T) {
testBytesMarshal(t, []byte{}, false)
})
t.Run("nil", func(t *testing.T) {
testBytesMarshal(t, nil, false)
})
}
func testBytesMarshal(t *testing.T, data []byte, wrongField bool) {
var (
wire []byte
err error
custom = stablePrimitives{FieldA: data}
transport = test.Primitives{FieldA: data}
)
if !wrongField {
wire, err = custom.stableMarshal(nil)
} else {
wire, err = custom.stableMarshalWrongFieldNum(nil)
}
require.NoError(t, err)
wireGen, err := transport.Marshal()
require.NoError(t, err)
if !wrongField {
// we can check equality because single field cannot be unstable marshalled
require.Equal(t, wireGen, wire)
} else {
require.NotEqual(t, wireGen, wire)
}
result := new(test.Primitives)
err = result.Unmarshal(wire)
require.NoError(t, err)
if !wrongField {
require.Len(t, result.FieldA, len(data))
if len(data) > 0 {
require.Equal(t, data, result.FieldA)
}
} else {
require.Len(t, result.FieldA, 0)
}
}